I have used Bilt Hamber auto-clay before, but that was the medium grade and used on a heavily contaminated car that was parked outside. This one, for George, is the fine clay. Since George is always kept indoors and washed regularly, I didn't see the need for a harsher than required product. If it's insufficient, I still have half of the medium compound remaining. That won't be till we're closer to the event date in October.